[HIVE-5563] Skip reading columns in ORC for count(*)

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 0.13.0
• Component/s: File Formats
• Assignee: Unassigned
• Reporter: Owen O'Malley
• Created: 16/Oct/13 17:10
• Updated: 23/Mar/14 18:20
• Resolved: 16/Oct/13 17:51

Description

With HIVE-4113, the semantics of ColumnProjectionUtils.getReadColumnIds was fixed so that an empty list means no columns instead of all columns. (Except the caveat of the override of ColumnProjectionUtils.isReadAllColumns.)

However, ORC's reader wasn't updated so it still reads all columns.

Issue Links

• duplicates: HIVE-5546 A change in ORCInputFormat made by HIVE-4113 was reverted by HIVE-5391